Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Employee deferrals deemed vested percentage upon contribution			100.00%
Defined contribution plan, cost	$ 1.1	$ 0.8	$ 2.5	$ 1.6
Maximum
Defined Benefit Plan Disclosure [Line Items]
Deferral percentage of base salary (up to)			80.00%
Deferral percentage of other compensation (up to)			100.00%